The Yale romanization of Cantonese was developed by Gerard P. Kok for his and Parker Po-fei Huang's textbook Speak Cantonese initially circulated in looseleaf form in 1952[1] but later published in 1958.[2] Unlike the Yale romanization of Mandarin, it is still widely used in books and dictionaries, especially for foreign learners of Cantonese. It shares some similarities with Hanyu Pinyin in that unvoiced, unaspirated consonants are represented by letters traditionally used in English and most other European languages to represent voiced sounds. For example, [p] is represented as b in Yale, whereas its aspirated counterpart, [pʰ] is represented as p.[3] Students attending The Chinese University of Hong Kong's New-Asia Yale-in-China Chinese Language Center are taught using Yale romanization.[4]

Modern Cantonese has up to seven phonemic tones. Cantonese Yale represents these tones using a combination of diacritics and the letter h.[5][6] Traditional Chinese linguistics treats the tones in syllables ending with a stop consonant as separate "entering tones". Cantonese Yale follows modern linguistic conventions in treating these the same as the high-flat, mid-flat and low-flat tones, respectively.

^Ng Lam & Chik 2000: 515. "Appendix 3: Tones. The student of Cantonese will be well aware of the importance of tones in conveying meaning. Basically, there are seven tones which, in the Yale system, are represented by the use of diacritics and by the insertion of h for ..."

^Gwaan 2000: 7. "Basically, there are seven tones which, in the Yale system, are represented by the use of diacritics and by the insertion of h for the three low tones. The following chart will illustrate the seven tones: 3 Mid Level, 1 High Level, 5 Low Falling, 6 Low Level..."